Toyota 4A-FE Repair Manual page 98

STOP
15A
AT171
AT180
, ,, OD] ' -
:::i I] ~
ll
r 1- _ , ..,.
r-=
i::-:i
, J J:iffi
1- , ~ .
.
~ · d~(
Ljl_
EFI 15A
, \
' '\
....
i
\ )
\ ,
EFI SYSTEM - Diagnosis System Fl-27
F12564
Fl3368
, . , .
..... .
_
....
,
F15182
CANCELLING DIAGNOSTIC CODE
1.
After repair of trouble area, the diagnostic code retained in
memory by the ECU must be cancelled out by removing
the fuse STOP 1 5A (AE) or EFI 1 5A (AT), located in the
engine compartment relay box, for 10 seconds or more,
depending on ambient temperature (the lower the tem-
perature, the longer the fuse must be left out} with the
ignition switch OFF.
HINT:
• Cancellation can also be done by removing the battery
negative
(8 )
terminal, but in this case, other memory
systems (clock, etc.) will also be cancelled out
• If the diagnostic code is not cancelled out, it will be
retained by the ECU and appear along with a new code
in the event of future trouble.
• If it is necessary to work on engine components requir-
ing removal of the battery terminal,
a
check must first
be made to see if a diagnostic code is has been
recorded.
2. After cancellation, do the road test of the vehicle the vehi-
cle to check that a normal code is now read on the
"CHECK ENGINE" warning light.
If the same diagnostic code appears, it indicates that the
trouble area has not been repaired thoroughly.
DIAGNOSIS INDICATION
1. Including "normal", the ECU is programmed with the
following diagnostic codes.
2. If two or more malfunctions are present at the same time,
the lowest-numbered diagnostic code will be displayed
first
3. All detected diagnostic codes, except code No.51, will be
retained in memory by the ECU from the time of detection
until cancelled out.
4 . Once the malfunction is corrected, the "CHECK ENGINE"
warning light on the instrument panel will go out but the
diagnostic code(s) will remain stored in ECU memory
(except for code No .51).